Type String Revision 2017.3060 Keywords steam, steamworks, userSteamId See also steamworks.appOwnerSteamId steamworks.*
The unique string ID of the user currently logged into the Steam client.
This will be nil if the steamworks.isLoggedOn property is false, indicating the application is not currently connected to the Steam client. It will also be nil if a valid appId was not set in config.lua as documented here.
local steamworks = require( "plugin.steamworks" ) print( "Steam App ID: " .. tostring(steamworks.userSteamId) )